ayan wrote: ↑Mon Nov 19, 2018 9:04 amI've seen two amps with a 3-way (on-off-on) Jazz/Rock switch, ... 
 
Just to avoid misunderstandings: 
Most transition generation ODS amps (classic stack, trigger pot OD entrance, ratio control) with a 
silver chassis I know first hand and/or heard of up to now have a Rock/Jazz (Guitar/Mic) toggle switch with an intentional PAB middle position. But most of these transition generation ODS amps with a 
silver chassis 
don't have 
an additional "manual/pedal" sliding switch for the PAB. You can see some examples here: 
http://thesubjectmatter.com/dumblearchive.html (#0075, #0077 and the silver transition generation ODS amp in the blue suede cabinet in the "blave" section). And here 
https://www.vintageandrare.com/product/ ... rettyPhoto is another example (Tom Verlaine ODS). There you'll see the "manual/pedal" switch for the overdrive (#0075: on the front; #0077, the silver/blue suede amp in the "blave" section and the Tom Verlaine ODS: on the back), but you'll see no "manual/pedal" switch for the PAB - nether on the back nor on the front. 
There's (up to now) only one transition generation ODS with a silver chassis I know of with a Rock/PAB/Jazz 3-position toggle switch on the front and two (PAB and OD) manual/pedal sliding switches on the back: 
https://www.thegearpage.net/board/index ... l.1951379/ 
Cheers,
Max